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Re: Host keys after cloning

from [Greg Wooledge] Network Security [Permanent Link]
Subject: Re: Host keys after cloning
Date: Fri, 27 Aug 2004 07:37:33 -0400 
On Thu, Aug 26, 2004 at 02:56:26PM -0400, Ugo Bellavance wrote:

  I just cloned a server to save install time, but now I realize that 
the ssh host key is the same for every server.  That makes sense since I 
cloned them, but I was wondering if that was insecure, and how to 
regenerate them.


1) Yes, it's generally a bad idea to use the same host keys on different
   hosts, unless you're running them as a cluster.

2) Delete the old host keys, and then regenerate them thus:

     ssh-keygen -t rsa1 -f /usr/local/etc/ssh_host_key -N ""
     ssh-keygen -t dsa -f /usr/local/etc/ssh_host_dsa_key -N ""
     ssh-keygen -t rsa -f /usr/local/etc/ssh_host_rsa_key -N ""

(Substitute the proper directory, of course, if yours aren't in
/usr/local/etc.)
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